build method

Implementation

@override
Future<void> build(BuildStep buildStep) async {
  /// Reading the configuration from build.yaml
  final config = options.config;

  /// Path to the fonts directory
  final fontPath = config['font_path'] as String? ?? 'assets/fonts/';

  /// Output directory for the generated file
  final outputDir = config['output_dir'] as String? ?? 'lib/generated';

  /// Minimum font size to generate
  final min = config['min'] as int? ?? 8;

  /// Maximum font size to generate
  final max = config['max'] as int? ?? 64;

  /// Default text color to use
  final defaultColorSetting =
      config['default_palette'] as String? ?? defaultColor;

  /// Name of the generated class (new functionality)
  final className = config['class_name'] as String? ?? 'TextStyles';

  /// Output file ID for the generated text styles
  final outputId = AssetId(
    buildStep.inputId.package,
    '$outputDir/text_styles.g.dart',
  );
  final fontsDir = Directory(fontPath);

  /// Check if the fonts directory exists
  if (!fontsDir.existsSync()) {
    await buildStep.writeAsString(outputId,
        _emptyGeneratedFile('Fonts directory "$fontPath" does not exist.'));
    log.severe(
        '[textstyle_generator] Fonts directory "$fontPath" does not exist.');
    return;
  }

  /// List of all .ttf and .otf font files
  final fontFiles = fontsDir
      .listSync(recursive: true)
      .whereType<File>()
      .where((f) => f.path.endsWith('.ttf') || f.path.endsWith('.otf'))
      .toList();

  /// Check if any fonts were found
  if (fontFiles.isEmpty) {
    await buildStep.writeAsString(
        outputId, _emptyGeneratedFile('No font files found at "$fontPath".'));
    log.severe('[textstyle_generator] No font files found in "$fontPath".');
    return;
  }

  /// Buffer for writing the Dart output file
  final buffer = StringBuffer();

  /// Set of already generated method names to avoid duplicates
  final generatedMethodNames = <String>{};

  /// Writing the file header
  buffer.writeln('// GENERATED CODE - DO NOT MODIFY BY HAND');
  buffer.writeln('// *****************************************************');
  buffer.writeln('//  textstyle_generator');
  buffer
      .writeln('// *****************************************************\n');
  buffer.writeln("part of '../textstyle_generator_trigger.dart';\n");

  /// Start of the configurable class (default: TextStyles)
  buffer.writeln('class $className {');
  buffer.writeln('  const $className._();\n');

  /// Iterate over all font files
  for (var i = 0; i < fontFiles.length; i++) {
    final fontFile = fontFiles[i];
    final name = fontFile.uri.pathSegments.last.split('.').first;
    final familyParts = name.split('-');
    final baseFamily = familyParts.take(familyParts.length - 1).join('-');
    final styleDescriptor =
    familyParts.length > 1 ? familyParts.last : 'Regular';
    final fontLower = _normalizeFamilyName(baseFamily);
    final parsed = _parseFontDescriptor(styleDescriptor);

    /// Generate methods for each font size
    for (var size = min; size <= max; size++) {
      final methodName = '$fontLower${size}w${parsed.weight}${parsed.suffix}';

      if (generatedMethodNames.contains(methodName)) {
        continue;
      }
      generatedMethodNames.add(methodName);

      final fontFullName = name;

      /// Write a method for a specific text style
      buffer.writeln(
          '  static TextStyle $methodName({Color? c, double? h, double? l}) => TextStyle(');
      buffer.writeln("    fontFamily: '$fontFullName',");
      buffer.writeln('    fontSize: $size,');
      buffer.writeln('    fontWeight: FontWeight.w${parsed.weight},');
      buffer.writeln('    color: c ?? $defaultColorSetting,');
      buffer.writeln('    height: h,');
      buffer.writeln('    letterSpacing: l,');
      buffer.writeln('  );\n');
    }
  }

  /// End of the configurable class
  buffer.writeln('}');

  /// Save the final output file
  await buildStep.writeAsString(outputId, buffer.toString());

  log.info(
      '[textstyle_generator] Successfully generated: $outputDir/text_styles.g.dart');
}